91 lines
2.4 KiB
C++
91 lines
2.4 KiB
C++
// OpenSTA, Static Timing Analyzer
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// Copyright (c) 2025, Parallax Software, Inc.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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//
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// The origin of this software must not be misrepresented; you must not
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// claim that you wrote the original software.
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//
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// Altered source versions must be plainly marked as such, and must not be
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// misrepresented as being the original software.
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//
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// This notice may not be removed or altered from any source distribution.
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#include "TokenParser.hh"
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#include <cctype>
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#include <cstring>
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namespace sta {
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TokenParser::TokenParser(const char *str,
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const char *delimiters) :
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delimiters_(delimiters),
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token_(const_cast<char*>(str)),
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token_delimiter_('\0'),
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first_(true)
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{
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// Skip leading spaces.
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while (*token_ != '\0' && isspace(*token_))
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token_++;
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token_end_ = strpbrk(token_, delimiters_);
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if (token_end_) {
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// Save the delimiter.
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token_delimiter_ = *token_end_;
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// Replace the separator with a terminator.
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*token_end_ = '\0';
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}
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}
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bool
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TokenParser::hasNext()
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{
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if (!first_) {
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// Replace the previous separator.
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if (token_end_) {
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*token_end_ = token_delimiter_;
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token_ = token_end_ + 1;
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// Skip spaces.
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while (*token_ != '\0' && isspace(*token_))
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token_++;
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// Skip delimiters.
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while (*token_ != '\0' && strchr(delimiters_,*token_) != nullptr)
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token_++;
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if (*token_ == '\0')
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token_ = nullptr;
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else {
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token_end_ = strpbrk(token_, delimiters_);
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if (token_end_) {
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// Save the delimiter.
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token_delimiter_ = *token_end_;
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// Replace the separator with a terminator.
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*token_end_ = '\0';
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}
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}
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}
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else
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token_ = nullptr;
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}
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return token_ != nullptr;
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}
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char *
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TokenParser::next()
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{
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first_ = false;
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return token_;
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}
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} // namespace
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